The US Coast Guard has included the Liberian flag in its QUALSHIP 21 (QS21) roster for 2019-2020. QS21 recognizes vessels and flag states which have successfully met specified safety and quality requirements and regulations when calling at ports in the US.
To qualify for QS21, flag administrations must have a three-year PSC detention ratio of less than 1.00% and be credited with 10+ PSC exams per year for the last three years.
Liberia and 8 other maritime nations were all new additions to the...
https://safety4sea.com/liberian-flag-added-to-uscg-qualship-21/